That's not the american date format; in the US they do it very strangely, with the month first, then the day, then the year, for example today would be shown as 4/21/2017.
That's a problem because UK and US formats look very similar, ambiguously so: for example, is 3/5/2017 the 5th of March or the 3rd of May?
The format on the camera feed, with the year first e.g. 2017-04-21, is a newer international format, designed to be understandable by both people and computers, and very carefully designed not to be ambiguous.

Apparently the lamps are all to be renovated and fitted with new LEDs. From http://www.sheffieldnewsroom.co.uk/historic-gas-lamps-set-to-shine-again-thanks-to-streets-ahead/ (the council's press release website):

The RSPB site has some good descriptions of the different species : https://www.rspb.org.uk/birds-and-wildlife/bird-and-wildlife-guides/bird-a-z/p/peregrine/
But, even with those descriptions I would have difficulty telling them apart based on their appearance. Their behaviour is a much better guide in my experience:
If I see it deliberately hovering in one place, not too high, staring at the ground: that's a Kestrel
If I see it flying very fast at low level through local woods or back gardens: that's a Sparrowhawk
Kestrels are quite common (for a bird of prey), and can often be seen over road verges. Sparrowhawks are also common, but don't make themselves as obvious. Peregrines are rare though, so location is a better practical guide: if I'm looking up at St. George's watching a bird perched near the nestbox, that's a Peregrine: otherwise, probably not.

You don't necessarily need camera footage to prove whose driving caused the collision; you can get a lot of evidence from where the drivers claimed they were going, which lane they were in, whether they were indicating or not, the angle and force of impact, etc. And if you've got any independent witnesses at the scene, even better. Good luck with the claim!

The flats might have a management company which is responsible for the yard (and other common areas); if so, that should smooth the process for you.
It's probably worth just knocking on doors and asking the flat tenants if they know what the deal is. If any are owner-occupiers, you might just be able to find out for free.